Thomas Charles-Edwards, the distinguished scholar of medieval Britain and Ireland, has made important contributions to a number of fields, but is particularly renowned for his studies in Celtic history and law. In this volume, colleagues pay tribute to his work with essays that range across the medieval Celtic world, including medieval Wales, Ireland and Scotland. In the first part of the volume, they cover historical aspects (and, as is fitting, often reflect the honorand's interest in archaeology and epigraphy); in the second, they focus on medieval Irish and Welsh legal institutions and texts, which are used by some to inform new readings of literary texts. Contributors: Susan Youngs, Clare Stancliffe, Catherine Swift, David N. Dumville, Elizabeth O'Brien, Edel Bhreathnach, Oliver Padel, Nancy Edwards, Thomas Owen Clancy, Marie Therese Flanagan, Huw Pryce, Roy Flechner, Robin Chapman Stacey,Wendy Davies, Sara Elin Roberts, Fergus Kelly, Bronagh Ní Chonaill, Charlene Eska, Elva Johnston, Máire Ní Mhaonaigh, Maredudd ap Huw.